click: override dirty_ratio on UMS

Change-Id: I2386f867301abc3648763ad445dea363ee7d8116

init.bahamas.rc

@@ -74,8 +74,6 @@ on boot
     write /proc/sys/kernel/sched_latency_ns 5000000
     write /proc/sys/kernel/sched_wakeup_granularity_ns 100000
     write /proc/sys/kernel/sched_min_granularity_ns 100000
-    write /proc/sys/vm/dirty_background_bytes 1024000
-    write /proc/sys/vm/dirty_bytes 10240000
 
     # Assign TCP buffer thresholds to be ceiling value of technology maximums
     # Increased technology maximums should be reflected here.

system.prop

@@ -69,6 +69,9 @@ dalvik.vm.heapsize=24m
 # Enable compcache
 ro.compcache.default=18
 
+# Lock dirty_ratio to 20 when USB is mounted for improved transfer speed
+ro.vold.umsdirtyratio=20
+
 # Makes HOME ADW / OTHERS to be always in memoory
 pref_lock_home=1